Pump-piston



(No Model.)

w. M. STEVENSON.

. PUMP PISTONP Y No. 329,235. Patented 0012.27, 1885 WITNESSES 1.7V VEJV TOR u. PETERS. Pholouflwgnphlr. Wuhhmon, o. a

UNITED STATES .PATENT OFFICE.

WILLIAM M. STEVENSON, OF SOUTH CLEVELAND, OHIO.

PUMP-PISTON.

SPECIFICATION forming part of Letters Patent No. 329,235, dated October 27, 1885.

Application filed March 19,1885.

To all whom it may concern:

Be it known that 1, WILLIAM M. STEVEN- SON, a citizen of the United States, residing at South Cleveland, in the county of Ouyahoga 5 and State of Ohio, have invented certain new and useful Improvements in Pump-Pistons, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in i pistons for lift or force pumps, and has for its object to provide a smooth-working piston which may be operated with comparatively small power. This object is attained by the devices illustrated in the accompanying draw- I ings, forming a part of this specification, in

which Figure 1 is a sectional view of the piston and a portion of a piston-rod. Figs. 2-, 3, 4, 5, 6, 7,8 are detached detailed views of the different parts composing the piston.

This piston consists of a short metal cylinder (indicated by the letter J) flanged at the bottom, and provided with a perforated top, J, and serrationsj, surrounded by a suitable 2 5 solid ring-packing, M, which is kept from slipping off at the bottom by the flange J. The perforated top is covered by a leather ring, j, which is surmounted by a metal cap, j, having a central opening for the passage of the lower end of the piston-rod R and of the hollow stem 3'' of a cage, 6, which limits the motion of the leather ring j, and at the same ti me permits the flow of water passing through the perforations-of the top J. The metal cap 3 5 j is provided with four pins, 0, which hold the Serial No. 159,456. (No model.)

leather j and the cap j together, and as these pins pass through the perforations of the top J of the cylinder J they also perform the function of guides, to maintain the valve or leather ring j in its proper position over the perfora- 0 tions in the top J. The lower end of the rod R is threaded, and provided with two nuts,w k w. The nut 10 is first placed in proper position on the rod R. The hollow stem j of cage 6 is then placedon the end of the rod R. Then the leather ring and its cap j are placed over the hollow stem j, and after the packing M has been placed over the-valve J the lower end of the rod R is passed through the central opening of the top J. The nut to is placed on 0 the end of the rod R, and is screwed up, which secures the piston firmly to the rod, and also binds the different parts of the piston together.

Having described my invention, What I desire to secureby Letters Patent and claim is The combination, with a piston-rod, of a cage having a hollow stem, and a metal cylinder flanged at the bottom and surrounded by a suitable solid ring-packing, said cylinder having a perforated top and serrations j said perforated top being covered by a leather ring, j, surmounted by a metal cap, j, having pins 0, the whole secured to each other by nuts to w, as described, and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM M. STEVENSON. Witnesses:

GEORGE W. DAY, EDMUND JAMES. 

